Stove for boiling purposes



G. DALEN STOVE FOR BOILING PURPOSES Filed March 6. 1924 2 Sheets-Shoot 1 G. DALEN STOVE FOR BOILING PURPOSES Filed March 6. 1924 2 Sheets-Shoot 2 INV EN TOR. "Dd/Zen l pi kit 0 ATTORNEYS.

VIII/III Patented Get. 27, 1925.

UNITED STATES PATENT OFFICE.

GUSTAF DALEN, OF SKARSA'IRA, STOGKHOLM', SWEDEN, ASSIGNOR TO SVENBKA.

AK'IIEBOLAGET GASACCUMULATOR, 0F STOCKHOLM, SWEDEN.

STOVE FOB. BOILING PURPOSES.

Application filed March 6, 1924. Serial No. 697,411.

To all whom it may concern:

Be it known that I, GUSTAF DALiiN, a subject of the King of Sweden, residing at Skarsatra, Lidingon, Stockholm, Sweden, have invented certain new and usefulImprovementsin Stoves for Boiling Purposes (for which I have filed applications in Sweden Mar. 10, 1922, No. 2854/22, and in Germany Feb. 11, 1922, No. 61,243), of which the following is a specification.

Hitherto, in stoves fired with any kind of fuel, the combustion gases or the flame have heated the boiling pot directl It is commonly known that heat applied in this .manner is employed in a very uneconomical manner.

The present invention has for its object to control the heat developed b the fuel in a considerably hi her degree t an hitherto and thereby to o tain a really economical boiling stove, as compared with the stoves hitherto used.

The invention is characterized by the arrangement of a heat-accumulator accumulating the heat from a firelace adapted for continuous firing, the sai accumulator delivering the accumulated heat to the boiling pots as required. Hereby the combustion gases from the fire preferably flow through the heat accumulator, heating the same. The fuel is always kept above the temperature of ignition by the heat accumulator, so as to be ignited as soon as combustion air is supplied. The said supply or control of t e combustion air according to one construction of the invention is automatic and is determined by the temperature of the heat accumulator. The com bustion gases from the fire-place may flow through more than one heat accumlator in succession, which receive and accumulate the heat remaining in the combustion gases, so that the combustion gases, when escaping from the last heat-accumulator, are comparatively cool.

The said heat-accumulators obviously receive successively decreasing temperatures. Such heat-accumulators at ower temperatures ma consist of one or more roasting ovens an one or more so called cook boxes.

The accompanying drawing illustrates as an example one construction according to the invention.

Fig. 1 shows a boiling stove in vertical section, provided with a single heat-accumulator,

Fig. 2 in vertical section but on a smaller scale shows a boiling stove with more than one heat accumulator, with an oven for roasting, and a cook box,

Fig. 3 is a view similar to Fig. 1 with a slight modification showing means for regulating the admission of fresh air to the stove,

Fig. 4 is an enlarged sectional detail of a further modification of a fresh air controlling device,

Fig. 5 is a vertical sectional view of a modified arrangement of receiver, and

Fig. 6 is a similar view of a further modication of a receiver.

In the construction according to Fig. 1, 1 indicates a metal block of comparatively large dimensions, in which a receiver 2 for solid fuel such as coal is provided. The lower part of the receiver 2 forms a fireplace with a grate 3 and an ash pit 4, into which a channel 5 for the supply of combustion air opens. 6 indicates the opening for the escape of the combustion gases generated in the fire-place to the lower part of a channel 7 in the metal block 1, from which channel the gases escape at 8. Into the channel a pipe 9 opens for the sup ly of secondary air from the exterior or om a controlling device 11 in chamber 10, controlling the opening 12 in the partition 13, Fig. 3.

The channel 5 is enlarged within the metal block 1 to form a room or chamber 10, in which a body sensitive to heat, is provided, the said body actuatin a flow opening for the combustion air owing throu h the chamber 10, as the temperature of t e heat accumulator varies. In the construction illustrated the said body sensitive to heat consists of an ex ansible box 11 or the like, placed between t e upper wall of the chamber 10 and an opening 12 in a partition 13 in the chamber, through which opening 12 the combustion air must pass in order to arrive in the ash it 4.

The flow opening 12 for the combustion air may be provided with a valve actuated by the body 11" as is apparent upon reference to Fig. 4.

The fuel receiver 2 is provided at its up )er part with a cover 14, and the fuel is supplied to the receiver through the upper opening 15, after the cover 14 has been removed.

The whole metal block is protected againstloss of heat by means of insulation 16 of any suitable heat insulating material, such as kieselguhr. At the top it is closed by a removable cap or cover 17.

The metal block serves as the heat-accumulator mentioned above. \Vhen the stove is not in use for boiling purposes the cover 17 is placed on the metal block 1 and the fuel resting on the grate 3 burns slowly as combustion air is supplied in a controlled amount through the channel 5. During the passage of the combustion gases through the channel 7 in the block, the said block accumulates heat. The block is by this means maintained at a constant temperature, inasmuch as if the temperature tends to fall, the body 11, which is sensitive to heat, increases the supply of combustion air, which results in a more vigorous combustion of the fuel and an inreased temperature of the block 1. If on t e contrary the temperature ofthe block is increased, the sensitive body 11 efi'ects a throttlin of the combustion air and consequently s ackens the fire on the grate 3. If the air is completely shut off the fuel-receiver will still remain above the temperature of ignition, so that as soon as the air is again admitted, combustion will immediately begin again.

When the apparatus is in use the cap or cover 17 is removed and the boiling pot is placed on the upper surface of the heat accumulator. A part of the heat accumulated in the block 1 is thereby transmitted to the boiling pot and its contents. Consequently the temperature of the heat-accumulator sinks and the body 11 sensitive to heat increases the supply of combustion air.

Fig. 2 illustrates a stove provided with a heat-accumulator 1 of the construction described above, in which the combustion ases escaping at 8 flow through a second eataccumulator 18, and thereafter through a third accumulator 19, in the interior constructed as a roasting oven 20, and are then caused to fiow around or through a fourth heat-accumulator 22, adapted as a so-called boiling box. By means of this combination of heat-accumulators the heat of the combustion gases is utilized as completely as ossible, so that said gases when they escape rom the last heat-accumulator at 23, they are comparatively cool. i

The fuel receiver or the fire space need not be placed within the heat-accumulator, but may be placed beneath it or outside it. The combustion gases need not flow through the heat accumulator, but may also pass over or around it.

In Fig. 5 there is illustrated a form of the device in which the fuel receiver 2 is placed outside of the heat accumulator 1 onlv penetrating one of its walls from the fire place 3, 4 which latter arrangement shown in Fig. 1 is placed within the metal block 1. The combustion gases from the fire place flow through the heat accumulator through the central passage 25 and in addition flow around the block 1' through the passage 7. The remaining parts are substantial y similar in construction to the arrangement shown in Fig. l the same reference being applied but provided with the letter c.

With reference to Fig. 6 there is illustrated a fire place 3*, 4 beneath the heat accumulator with the fuel receiver 2 arranged in the same manner in Fig. 5. According to this construction the central passage 25" is employed as an escape for the combustion gases. The remaining parts are of substantially the same construction as shown in Figs. 1 and 5, the numerals being provided with the reference letter d'.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed I declare that what I claim is 1. In a boiling stove, a heat accumulator in the form of a metal block, a fuel receiver, a fire place in communication with the receiver and with said block, means for admitting combustion air to the fire place, an annular chamber provided between the receiver and the block for receiving products of combustion from the fire place, and means for exhausting the products of combustion from the chamber.

2. In a boiling stove, a heat accumulator in the form of a metal block, a fuel receiver, closed at the top, a fire place in communication with the receiver, means for admitting combustion air to the fire for conducting the products 0 combustion in contact with the block, means for exhausting said products of combustion, and means, responsive to the temperature of the heat accumulator for automatically controlling the passage of combustion air to the fire place.

3. In a boiling stove, a plurality of heat accumulators, arranged in abutting relation,

a fire place in one of said accumulators, 1

adapted for continuous combustion of solid fuel. and means for leading the products of combustion through each of the accumulators in succession.

4. In a boiling stove as claimed in claim 3, wherein means is provided for automatically controlling the passage of combustion air to the fire place, said means responsive of the tem erature of the heat accumulator.

5. In a oiling stove, a heat accumulator in the form of a metal block, a fuel receiver in said block, a fire place in communication with said receiver, means for admitting combustion air to the fire place, an annular chamber provided between the receiver and place, means 1 the block for receiving products of com bastion from the receiver, and means for exhaustingethe products of combustion from l v the cham 6. In a boiling stove, a heat accumulator in the form of a metal block, a closed fuel receiver in said block, 'a fire place in communication with the receiver, means for ad'- mitting combustion air to the fire place, an annular chamber provided between the receiver and the block for receiving products -of combustion from the receiver, means for exhausting the products of combustion from the block, and means responsive to the temperature of the .heat accumulator for automatically controlling the passage of combustion air to the fire place.

7. In a boiling stove, a plurality of heat accumulators arranged in abutting relation and each being in the form of a ifietal block, a fuel receiver in one of said accumulators, a fire place in communication with the receiver, means for admitting combustion air to the fire place, and means for circulating the products of combustion through each of the accumulators in succession.

8. In a boiling stove as claimed in claim 7, wherein means is provided for automatically controlling the passage of combustion air to the fire place, said means being responsive to the temperature of the heat accumulator.

In testimony whereof I have signed my name to this specification;

GUSTAF DALEN.

the block for receiving products of combustion from the receiver, and means for exhaustin the products of combustion from the chem r. I

6. In a boiling stove, a heat accumulator in the form of a metal block, a closed fuel receiver in said block, a fire place in communication with the receiver, means for admitting combustion air to the fire place, an annular chamber provided between the receiver and the block for receiving products of combustion from the receiver, means for exhausting the products of combustion from the block, and means responsive to the temperature of the heat accumulator for automatically controlling the passage of combustion air to the fire place.

7 In a boiling stove, a plurality of heat accumulators arranged in abutting relation and each being in the form of a 'metal block, a fuel receiver in one of said accumulators, a fire place in communication with the receiver, means for admitting combustion air to the fire place, and means for circulating the products of combustion through each of the accumulators in succession.

8. In a boiling stove as claimed in claim 7, wherein means is provided for automatically controlling the passage of combustion air to the fire place, said means being responsive to the temperature of the heat accumulator.

In testimony whereof I have signed my name to this specification.

GUSTAF DALEN.

Certificate of Correction. It is hereby certified that in Letters Patent No. 1,559 162-, granted October 27,

I925, upon the application of Gustaf Daln, of Skarsatra, improvement in Stoves for Boiling Purposes]? errors ap follows: Page 1, line 8, read October 3, 1922, and line 9, for Feb. 11, 1922 specification requiring correction as tockholm, Sweden, for an r in the printed or Mar. 10,1922 read November 2, 1922; and

that the said Letters Patent should be read with these corrections therein that the same ma conform to the record of the case in the Patent Oflice.

Signe and sealed this 9th day of March, A. D. 1926.

M. J. MOORE, Acting Commissioner of PM.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,559162, granted October 27, 1925, upon the application of Gustaf Daln, of Skarsatra, tockholm, Sweden, for an improvement in Stoves for Boiling Purposes}? errors apear in the prm specification requiring correction as follows: Page 1', line 8, or Mar. 10,1922 read October 3, 1922, and line 9 for Feb. 11, 1922 read November 2, 192; and that the said Letters Patent should be read with these oorreotions therein that the same ma conform to the record of the casein the Patent Oflice.

Signs and sealed this 9th day of March, A. D. 1926.

[min] M. J. MOORE,

Acting Ommniasioner of Patents. 

